(1. 哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，哈爾濱150001；
2. 哈爾濱工業(yè)大學(xué) 金屬精密熱加工國家級重點實驗室，哈爾濱150001)
摘 要: TiAl合金作為新型輕質(zhì)高溫結(jié)構(gòu)材料，其熔煉及制備技術(shù)難度大、鑄態(tài)組織較粗大、室溫塑性較低和高溫抗氧化能力的不足成為限制其應(yīng)用的關(guān)鍵。從材料制備成形和合金成分兩個角度綜述稀土元素Y在TiAl基合金中應(yīng)用的研究進(jìn)展，總結(jié)國內(nèi)外對Y2O3陶瓷坩堝和型殼面層在TiAl合金熔煉和精密鑄造及制備成形過程中的研究進(jìn)展；闡述稀土元素Y在合金中的形態(tài)與分布及其對合金鑄態(tài)組織的細(xì)化及作用機理，并分析Y對合金室溫力學(xué)性能和抗氧化性能的影響，對Y在TiAl基合金中的進(jìn)一步研究應(yīng)用提出建議。
關(guān)鍵字: TiAl基合金；稀土元素Y；組織細(xì)化；力學(xué)性能；抗氧化性能
（1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
2. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China）
Abstract:As a highly promising material for high-temperature structural applications, the weakness of TiAl alloy such as vulnerability for instance, smelting process controlling, coarse casting microstructure, low room temperature ductility and poor high temperature anti-oxidation properties becomes the key factors to limit its application. From the perspectives of refractory application and alloying elements, the status of the research on rare earth yttrium (Y) in TiAl based alloy was summarized. The domestic and foreign researches of Y2O3 worked as ceramic crucibles and shell surface in TiAl based alloy on smelting process and investment casting were stated, and the mechanism of contamination and interaction between alloy and refractory was discussed. The morphology and distribution of element Y in alloy matrix and its refining effect on the as-cast grain and lamellar spacing as well as the refinement mechanisms were expounded emphatically. The complex influence of rare earth element Y on room temperature tensile strength and ductility as good as enhanced temperature oxidation resistance were analyzed systematacially. Some suggestions for the research on rare earth element Y in γ-TiAl based alloys were proposed.
Key words: TiAl based alloy; rare earth element yttrium; microstructure refinement; mechanical property; oxidation resistance
